It sometimes is. The character Shylock was Jewish. He was also someone who loaned money at high interest rates.

Trump was talking about borrowing money, not about Jews. So in that context, probably not antisemitic. Though given the audience, it could be a dog whistle.

It’s mostly a nothing burger.

So just another case of attacking Trump on something unimportant and diverting attention from the actual terrible things he’s doing.